../net/ethtool/netlink.c:681:12: warning: unused function 'ethnl_perphy_start' [-Wunused-function]
  681 | static int ethnl_perphy_start(struct netlink_callback *cb)
      |            ^~~~~~~~~~~~~~~~~~
../net/ethtool/netlink.c:791:12: warning: unused function 'ethnl_perphy_dumpit' [-Wunused-function]
  791 | static int ethnl_perphy_dumpit(struct sk_buff *skb,
      |            ^~~~~~~~~~~~~~~~~~~
../net/ethtool/netlink.c:815:12: warning: unused function 'ethnl_perphy_done' [-Wunused-function]
  815 | static int ethnl_perphy_done(struct netlink_callback *cb)
      |            ^~~~~~~~~~~~~~~~~
3 warnings generated.